CN210606654U

CN210606654U - Critical heat flux density enhancement test device

Info

Publication number: CN210606654U
Application number: CN201921014917.1U
Authority: CN
Inventors: 田道贵; 陈炼; 张祥; 张蕾; 江斌; 常华健
Original assignee: State Nuclear Huaqing Beijing Nuclear Power Technology R & D Center Co ltd; State Power Investment Group Science and Technology Research Institute Co Ltd
Current assignee: State Nuclear Huaqing Beijing Nuclear Power Technology R & D Center Co ltd; State Power Investment Group Science and Technology Research Institute Co Ltd
Priority date: 2019-07-01
Filing date: 2019-07-01
Publication date: 2020-05-22
Anticipated expiration: 2029-07-01

Abstract

The application discloses critical heat flux density reinforcing test device, this critical heat flux density reinforcing test device includes: the first end of the isolation cylinder is provided with a mounting position for mounting the test body and a lower opening for opening the first end face of the test body, and the second end of the isolation cylinder is opened and is provided with a connecting flange; the adapter flange is connected with the connecting flange; the heating body is arranged in the isolation cylinder, the first end face of the heating body is used for being attached to the second end face of the test body, and the heating body is provided with a heating hole along the axial direction; the heater is arranged in the heating hole; and the press fitting flange is press fitted on the second end surface of the heating body and is detachably connected with the first end of the isolation cylinder through a threaded connecting piece. The critical heat flux density testing device is of a split structure design, can realize the replacement of a test body through convenient and quick disassembly and assembly, can repeatedly use a heating body, can greatly reduce the testing cost, and can improve the testing efficiency.

Description

Critical heat flux density enhancement test device

Technical Field

The application belongs to the technical field of thermal hydraulic power, and particularly relates to a critical heat flow density enhancement test device.

Background

As one of the key measures to mitigate the consequences of an accident, the melt pressure vessel retention (IVR) technique has recently been put to practical use in the nuclear industry. Reactor pressure vessel external cooling (ERVC) is an important solution to achieving IVR. When the heat flux density of the lower end socket of the pressure container is less than the critical heat flux density (CHF) of the corresponding position of the outer surface of the pressure container, the outer surface of the pressure container can be ensured to be cooled, and the integrity of the outer surface of the pressure container can be maintained. CHF therefore determines the ERVC cooling capacity limit. The greater the CHF value, the greater the safety margin of the pressure vessel and the greater the feasibility of IVR-ERVC measures. The IVR-ERVC strategy has enough safety margin on a medium-small power reactor, but the heat flux density inside the lower end enclosure of the pressure vessel on the high-power reactor is continuously improved, and the CHF limit value needs to be improved for further improving the IVR effectiveness.

Therefore, critical heat flux density enhancement test research is widely carried out at home and abroad, a large number of CHF influence factors are considered, and partial tests show that the CHF can be remarkably improved by surface coatings such as coolant water chemistry characteristics, special surface structures, porous hydrophilic media, nano materials and the like. However, in the critical heat flux density enhancement test related to the surface characteristics, the used test device has a complex structure, the heating body and the test block are integrated, when the test is carried out on different test blocks, the whole test body needs to be replaced, and the test cost is high. This limits the number of tests to a certain extent and makes intensive and thorough research difficult.

Disclosure of Invention

The present application is directed to solving at least one of the problems in the prior art.

The application provides a critical heat flux density reinforcing test device, includes: the first end of the isolation cylinder is provided with a mounting position for mounting a test body and a lower opening for opening the first end face of the test body, the mounting position is provided with a heat insulation sealing gasket, and the second end of the isolation cylinder is opened and is provided with a connecting flange; the adapter flange is connected with the connecting flange and is used for connecting a metal hose; the heating body is arranged in the isolation cylinder, a first end face of the heating body is used for being attached to a second end face of the test body, and the heating body is provided with a heating hole along the axial direction; a heater installed at the heating hole; and the press fitting flange is press fitted on the second end surface of the heating body and is detachably connected with the first end of the isolation cylinder through a threaded connecting piece.

The critical heat flux density testing device is of a split structure design, can realize the replacement of a test body through convenient and quick disassembly and assembly, can repeatedly use a heating body, can greatly reduce the testing cost, and can improve the testing efficiency.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural diagram of a critical heat flux density enhancement test apparatus according to an embodiment of the present application;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a longitudinal sectional view of a heating body of an embodiment of the present application;

fig. 4 is an end view of the heating body of the embodiment of the present application;

FIG. 5 is an end view of a press-fit flange according to an embodiment of the present application;

FIG. 6 is a longitudinal cross-sectional view of a press-fitting flange according to an embodiment of the present application;

FIG. 7 is an end view of a support flange of an embodiment of the present application;

FIG. 8 is a longitudinal cross-sectional view of a support flange of an embodiment of the present application;

FIG. 9 is a longitudinal sectional view of a test body according to an embodiment of the present application;

fig. 10 is a partial enlarged view at B in fig. 9;

FIG. 11 is a partial plan view of a test body according to an example of the present application.

Reference numerals:

the critical heat flux density enhancement test apparatus 100,

a supporting flange 10, an external thread 11, a lower opening 12, a supporting groove 13, a threaded hole 14, a heat-insulating sealing gasket 15,

a press-fitting flange 20, a through hole 21, a gap 22, a press-fitting groove 23, a threaded connector 24, a spring pad 25, a heat insulation pad 26,

a heating body 30, a heating hole 31,

the temperature of the heater 40 is controlled by the temperature of the heater,

the distance sleeve 50, the connecting flange 51, the rotating shaft 52,

the combination of the adaptor flange 60, the metal hose 61,

a test body 70, a test hole 71, a notch 72, a guide surface 73, a heating groove 74, a thermocouple 75,

the layer of insulation 80 is provided,

chassis 91, drain pipe 92, box 93, upper cover 94, support frame 95, wind channel 96.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

A critical heat flux density enhancement test apparatus 100 according to an embodiment of the present application is described below with reference to fig. 1 to 11.

As shown in fig. 1, a critical heat flux density enhancement test apparatus 100 according to an embodiment of the present application includes: the device comprises an isolation cylinder, a switching flange 60, a heating body 30, a heater 40 and a press-fitting flange 20.

The first end (the lower end in fig. 2) of the isolation cylinder is provided with a mounting position for mounting the test body 70 and a lower opening 12 for opening the first end face of the test body 70, the mounting position is provided with a heat insulation sealing gasket 15, the second end (the upper end in fig. 2) of the isolation cylinder is open and provided with a connecting flange 51, the adapter flange 60 is connected with the connecting flange 51, a sealing ring can be clamped between the adapter flange 60 and the connecting flange 51, the adapter flange 60 is used for connecting a metal hose 61, the metal hose 61 can be a corrugated pipe, and an air duct 96 is arranged in the metal hose 61.

The heating body 30 is installed in the insulating cylinder, a first end surface (a lower end surface in fig. 2) of the heating body 30 is used for being attached to a second end surface (an upper end surface in fig. 2) of the test body 70, the heating body 30 has a heating hole 31 along the axial direction, the heater 40 is installed in the heating hole 31, and the heater 40 may be an electric heater.

The press-fitting flange 20 is press-fitted onto a second end face (upper end face in fig. 2) of the heating body 30 and is detachably connected to the first end of the insulating cylinder by means of a threaded connection 24.

During the experiment, can place an isolation section of thick bamboo in box 93, box 93 can make for temperature resistant glass, and box 93 is placed on chassis 91, and box 93 lower extreme is equipped with drain pipe 92, and the upper end of box 93 is equipped with upper cover plate 94, and box 93 is used for the dress to the submergence of an isolation section of thick bamboo, like this, experimental body 70 can be through lower uncovered 12 and water contact, and keep dry environment in the isolation section of thick bamboo.

The isolation cylinder can be a cylindrical sealing structure. The upper end of the isolation cylinder is connected with a metal hose 61, and a cable and a thermocouple 75 are electrified in the hose. The isolation of the heating body 30, the heating rod and other structures from the external coolant is realized by the isolation cylinder. The test body 70 is nested in the support flange 10, and the test body and the support flange are sealed by high-temperature glue and a heat-insulating sealing gasket 15. The heating body 30 is in the insulating cylinder, and the lower end surface thereof is closely attached to the test body 70, so that the heat generated by the heater 40 is transmitted to the test body 70. The test body 70 and the heating body 30 are fastened to the support flange 10 by means of the press-fitting flange 20 and the threaded connection 24.

The critical heat flux density enhancement test device 100 may further include a heat insulation layer 80, the heat insulation layer 80 is wrapped outside the isolation cylinder, and the heat insulation layer 80 is exposed out of the lower opening 12. The insulating layer 80 is coated outside the isolating cylinder to prevent the heat generated in the test device from being led out through the side wall of the isolating sleeve 50. The test device provides a heat source through the high-power heater 40, judges the occurrence of CHF through temperature information monitored by the thermocouple 75 arranged in the test body 70, and monitors the temperature through the thermocouple 75 arranged on the outer wall of the heating body 30 so as to ensure the safety of the heating body 30.

In the test process, the heater 4 of the test apparatus was first energized, and the electric power was gradually increased. To ensure safety and reliability of test data, the power increase does not exceed 20% of the last stable power each time. After each power adjustment, it is ensured that the thermocouple 75 temperature indication in the test body 70 does not rise any further and stabilizes until power is increased. When the thermocouple 75 in the test body 70 monitors that the temperature flies up by 5-15 ℃/s and does not fall back, the CHF is judged to occur and the power supply is rapidly cut off, and the heat flow density of the heating surface of the test body 70 at the moment is the critical heat flow density required to be obtained in the experiment. The critical heat flux density is calculated by

It should be noted that, the critical heat flux density enhancement test device 100 of the present application can conveniently replace the test body 70, and when the test body 70 needs to be replaced, the first end of the isolation cylinder can be opened by detaching the adapter flange 60 and the connecting flange 51, and then the press fitting flange 20 is detached, so that the heating body 30 and the heater 40 can be pulled away, the test body 70 is replaced, and the operation is reversed during the assembly.

The critical heat flux density testing device is of a split structure design, can realize the replacement of the test body 70 through convenient and quick disassembly, can repeatedly use the heating body 30, can greatly reduce the testing cost, and can improve the testing efficiency.

In some embodiments, as shown in fig. 3 and 4, the heating hole 31 penetrates the heating body 30 in the axial direction of the heating body 30, the heating hole 31 includes a plurality of spaced apart, and the heater 40 includes a rod protruding into the heating hole 31. Specifically, the heating body 30 is provided at the center thereof with a heating hole 31, a plurality of heating holes 31 are provided at regular intervals in the circumferential direction of the heating hole 31, and a heater 40 is installed in each heating hole 31. Thus, the heating power of the heating body 30 is large and the heating is uniform.

As shown in fig. 1 and 2, the critical heat flux density enhancement test apparatus 100 may further include: the rotating shaft 52, the rotating shaft 52 is connected with the isolating cylinder, and the rotating shaft 52 is used for being connected with a driving mechanism. In actual implementation, the two sides of the middle position of the isolation sleeve 50 are respectively welded with a sleeve, the sleeve is fixedly connected with the rotating shaft 52, the upper cover plate 94 is provided with a support frame 95, the rotating shaft 52 is supported on the support frame 95 through a bearing, the rotating shaft 52 penetrates through the box body 93 and is connected with an external driving mechanism, so that the isolation cylinder can be hoisted, and the inclination angle of the heating surface of the test body 70 can be adjusted through the external driving mechanism, so as to meet more test requirements.

In some embodiments, as shown in fig. 5 and 6, the press-fitting flange 20 is annular, the central hole of the press-fitting flange 20 is used for avoiding the heating hole 31 of the heating body 30, the press-fitting flange 20 is provided with a plurality of through holes 21 distributed at intervals along the circumferential direction, the through holes 21 surround the outer circumference of the heating body 30 and are spaced apart from the circumferential wall of the heating body 30, and the threaded connectors 24 penetrate through the through holes 21, so that the stress of each region of the press-fitting flange 20 is balanced, and the heating body 30 can be better pressed on the surface of the test body 70. As shown in fig. 2, the threaded connector 24 may be a stud bolt, the stud bolt penetrates through the through hole 21, the lower end of the stud bolt is in threaded connection with the support flange 10, the upper end of the stud bolt is sleeved with the spring pad 25, and then a nut is screwed, so that the heating body 30 is pressed by the elastic force of the spring pad 25.

As shown in fig. 2, the outer diameter of the press-fitting flange 20 is smaller than the inner diameter of the insulating cylinder, and a plurality of notches 22 are formed in the outer periphery of the press-fitting flange 20. The notch 22 is used for holding the press-fitting flange 20 when the press-fitting flange 20 is mounted or dismounted, the notch 22 may be fan-shaped, and the distance from the bottom wall of the notch 22 to the center of the press-fitting flange 20 is approximately equal to the distance from the center of the through hole 21 to the center of the press-fitting flange 20, so that the notch 22 has little influence on the strength of the press-fitting flange 20. In addition, the notches 22 increase the air convection velocity across the press-fitting flange 20.

As shown in fig. 6, the second end surface of the press-fitting flange 20 facing the heating body 30 is provided with a press-fitting groove 23, the bottom wall of the press-fitting groove 23 is used for abutting against the second end surface of the heating body 30, and the peripheral wall of the press-fitting groove 23 is tapered. The tapered press-fitting groove 23 can play a guiding role so that the heating body 30 can be automatically centered, and certainly, as shown in fig. 2, a heat insulating pad 26 can be further clamped between the bottom wall of the press-fitting groove 23 and the heating body 30 during assembly.

In some embodiments, as shown in fig. 2, 7, 8, the isolation cartridge comprises: the spacer sleeve 50 and the support flange 10, wherein a first end of the spacer sleeve 50 is open, the spacer sleeve 50 is tubular, two ends of the spacer sleeve are open, and the spacer sleeve 50 can be a steel sleeve. The threaded connection of the lower end of the support flange 10 and the isolation sleeve 50, for example, the outer peripheral wall of the support flange 10 may be provided with an external thread 11, and the inner peripheral wall of the lower end of the isolation sleeve 50 may be provided with an internal thread, so that the support flange 10 and the isolation sleeve 50 are convenient to disassemble and assemble, and certainly, in the conventional test, when the test body 70 is replaced, the support flange 10 does not need to be disassembled.

The support flange 10 is connected with a threaded connector 24, and the mounting position and the lower opening 12 are arranged on the support flange 10. As shown in fig. 7 and 8, the support flange 10 may be provided with a plurality of threaded holes 14, and the threaded connector 24 may be a double-threaded screw, the lower end of which is threadedly coupled with the threaded hole 14.

As shown in fig. 2 and 8, the support flange 10 has a multi-step type support groove 13 facing the heating body 30, the support groove 13 defines a mounting location, the heat insulating gasket 15 has a step type outer circumferential surface and is mounted to the support groove 13, and the heat insulating gasket 15 is pressed against the support groove 13 at least at two mutually perpendicular surfaces. The outer periphery of the heat insulating gasket 15 is also stepped, and the step surface of the heat insulating gasket 15 abuts against one step surface of the support groove 13, and the peripheral walls at both ends of the step surface of the heat insulating gasket 15 abut against both peripheral walls of the support groove 13, respectively. Correspondingly, the outer periphery of the test body 70 may be provided with an annular step surface, and supported by the insulating seal 15 through the step surface, so that the insulating seal 15 can achieve both radial and axial sealing.

In some embodiments, the critical heat flux density enhancement experimental apparatus 100 may further include: test body 70.

As shown in fig. 2, the test body 70 is mounted on the mounting site, a first end surface (a lower end surface in fig. 2) of the test body 70 is exposed from the lower opening 12, a second end surface (an upper end surface in fig. 2) of the test body 70 is attached to the first end surface of the heating body 30, a plurality of test holes 71 extending toward the axial center are provided in a peripheral wall of the test body 70, distances from the plurality of test holes 71 to the second end surface of the test body 70 are different, and thermocouples 75 are inserted into the test holes 71. Test body 70 was used to simulate the bottom head of a pressure vessel.

The test body 70 includes an oxygen-free copper substrate and a steel layer covering a first end surface (a lower end surface in fig. 9) and a second end surface (an upper end surface in fig. 9) of the oxygen-free copper substrate, and the steel layer at the second end surface has a porous coating layer.

In actual implementation, the heated surface of the test body 70 is welded with a thin steel layer by using an explosive welding technology, so that the consistency between the heated surface material and a prototype (a lower end socket of a pressure vessel) is ensured, and the data obtained by the test has more engineering guidance value. In addition, the porous coating is prepared on the heating surface of the test body 70 by adopting a cold spraying technology, so that boiling heat exchange and critical heat flux density can be effectively enhanced, and a foundation is laid for further improving the effectiveness of IVR.

As shown in fig. 9, a heating groove 74 is provided on the second end surface (upper end surface in fig. 9) of the test piece 70, and the peripheral wall of the heating groove 74 is a tapered surface. The conical heating groove 74 facilitates the self-centering of the heating body 30.

As shown in fig. 10, the upper wall of the open end of the test well 71 is provided with a guide surface 73. This facilitates installation of the thermocouple 75, and can prevent the wire of the thermocouple 75 from being scratched.

As shown in fig. 11, the peripheral wall of the test piece 70 is provided with a slit 72 that penetrates the test piece 70 in the axial direction, the test hole 71 is opened in the slit 72, and the width of the slit 72 is larger than the diameter of the test hole 71.

The critical heat flux density enhancement test apparatus 100 of one embodiment of the present application is described below.

As shown in fig. 2, the critical heat flux density enhancement test apparatus 100 according to the embodiment of the present application includes: the test device comprises a heat insulation sealing gasket 15, a test body 70, a heating body 30, a heater 40, a rotating shaft 52, an isolation sleeve 50, bolts, a supporting flange 10, a thermocouple 75, a threaded connector 24, a press fitting flange 20, a spring pad 25, a heat insulation pad 26, a heat insulation layer 80 and a metal hose 61.

As shown in fig. 2, the device is a cylindrical sealing structure. The lower end of the isolation sleeve 50 is connected and sealed with the support flange 10 through threads, the upper end is connected with the metal hose 61, and the inside of the metal hose is provided with an electrified cable and a thermocouple 75 wire. The isolation of the heating body 30, the heating rod, and the like from the external coolant is achieved by the isolation sleeve 50. The test body 70 is nested in the support flange 10, and the test body and the support flange are sealed by high-temperature glue and a heat-insulating sealing gasket 15. The heating body 30 is arranged in the isolation sleeve 50, the lower end surface of the heating body is tightly attached to the test body 70, and the heat generated by the heating rod is transferred to the test body 70. The test body 70 and the heating body 30 are fastened to the support flange 10 by means of the press-fitting flange 20 and the threaded connection 24. The insulating layer 80 is externally applied to the isolation sleeve 50, so that heat generated in the test device is prevented from being led out through the side wall of the isolation sleeve 50. The two sides of the middle position of the isolation sleeve 50 are respectively welded with a rotating shaft 52 sleeve of an indexing mechanism, and the inclination angle of the heating surface of the test body 70 is adjusted through an external indexing mechanism. The test device provides a heat source through the high-power heater 40, judges the occurrence of CHF through temperature information monitored by the thermocouple 75 arranged in the test body 70, and monitors the temperature through the thermocouple 75 arranged on the outer wall of the heating body 30 so as to ensure the safety of the heating body 30.

As shown in fig. 9, the test piece 70 is a cylindrical boss with a narrow bottom and a wide top, the main body is made of TU1 oxygen-free copper, and the lower surface is a heating surface. Cylindrical test holes 71 with phi of 1.1mm are drilled at 3 different height positions away from the heating surface in the test body 70, and the front ends of the test holes 71 are communicated with the axis of the test body 70. Thermocouples 75 are respectively inserted into the test holes 71 to measure temperature values of the test body 70, and the occurrence of CHF is judged based on the monitored temperature information. The upper surface of the test body 70 is of a concave structure with a conical slope surface, so that the heating body 30 can be conveniently inserted and mounted.

A layer of SA508III steel with the thickness of 2.5mm is welded on the heating surface of the test body 70 in an explosion welding mode and is consistent with the surface material of the lower end socket of the prototype pressure vessel, so that the data obtained by the test has actual guiding value. And preparing a porous coating on the surface of the steel layer by adopting a cold spraying mode so as to increase the heat transfer area, and a micro-liquid layer liquid supplement flow passage and a steam overflow passage, thereby strengthening boiling heat exchange and enhancing critical heat flux density.

As shown in fig. 3, the heating body 30 is a cylindrical structure and made of TU1 oxygen-free copper. The heating body 30 is internally provided with 9 uniformly distributed heating holes 31 along the axial direction, and the circle center of one heating hole 31 is superposed with the axle center of the heating body 30. A heater 40 is placed in the heating hole 31 as a heating source. The end face of the bottom of the heating body 30 is closely attached to the end face of the circular heating groove 74 of the test body 70 to reduce the contact thermal resistance. The thermocouple 75 is installed on the side wall pressing piece of the heating body 30 to monitor the temperature of the heating body 30 and prevent the heating body 30 from overtemperature, thereby ensuring the safety of the heating body 30.

The spacer 50 is cylindrical in configuration. The inner wall surface of the lower end of the steel sleeve contains internal threads, and the internal threads are sealed with the support flange 10 through threads. The upper end of the steel sleeve is of a flange structure and is connected with a metal hose 61 with a flange. The isolation of the heating body 30, the heating rod, and the like from the external coolant is achieved by the isolation sleeve 50. The sleeve pipes are respectively welded on two sides of the middle position of the isolation sleeve 50, the rotating shaft 52 of the external driving mechanism is inserted into the sleeve pipe of the rotating shaft 52, the whole testing device is driven to rotate through the rotating shaft 52, and the adjustment of the orientation inclination angle of the heating surface of the test body 70 is realized.

The insulating layer 80 is externally coated on the isolation sleeve 50, and the thickness is 40 mm. The insulating layer 80 is made of a heat-insulating and waterproof material, and is used for waterproof and heat insulation of the isolation sleeve 50 so as to prevent the isolation sleeve 50 from directly contacting with an external coolant to cause boiling. In the process of dismounting and replacing the test body 70, the heat insulation layer 80 does not need to be dismounted and replaced.

As shown in fig. 5-8, the press-fitting flange 20 and the support flange 10 are both of a socket flange structure.

The socket inner hole surface of the press-fitting flange 20 is a tapered slope surface, which facilitates the centering insertion of the heating body 30 into the socket hole. A heat insulating pad 26 is arranged between the top end face and the socket end face of the heating body 30 for heat insulation. The flange end face is petal-shaped, so that the flange is convenient to disassemble and assemble.

The supporting flange 10 comprises a double-layer bell mouth, the test body 70 is nested in the bell mouth hole of the supporting flange 10, and high-temperature glue and a heat-insulating sealing gasket 15 are adopted between the test body and the supporting flange for heat insulation and sealing. The outer wall of the support flange 10 is threaded and is sealed with the inner wall of the lower end of the steel sleeve through threads. During the disassembly and replacement of the test body 70, the support flange 10 does not need to be disassembled.

The press-fitting flange 20 is uniformly provided with 4 through holes 21, and the supporting flange 10 is uniformly provided with 4 non-through threaded holes 14. The upper and the supporting flanges 10 are fastened with the test body 70 and the heating body 30 through the screw thread connecting piece 24. One end of a threaded connector 24 is inserted into a threaded hole 14 of the support flange 10, and the other end of the threaded connector passes through a bolt hole of the press mounting flange 20, is sleeved into a 3-layer spring pad 25, and is pressed tightly through a nut.

Aiming at the defects of the prior art, the application provides a critical heat flow density enhancement test device 100 capable of being quickly disassembled and assembled, which is used for developing a critical heat flow density enhancement test on the surface of a prototype material under a pool-type boiling condition, and carrying out critical heat flow density enhancement mechanism research and enhancement measure verification.

The application discloses critical heat flux density test device of split type structural design can realize that convenient, the quick assembly disassembly of test piece is changed to reuse heating member 30, thereby very big reduction testing cost improves test efficiency. A thin steel layer is welded on the heating surface of the test body 70 by adopting an explosive welding technology, so that the consistency of the heating surface material and the prototype is ensured, and the data obtained by the test has more engineering guidance value. The porous coating is prepared on the heating surface of the test body 70 by adopting a cold spraying technology, so that boiling heat exchange and critical heat flux density can be effectively enhanced, and a foundation is laid for further improving the effectiveness of IVR.

In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. A critical heat flux density enhancement test device, comprising:

the first end of the isolation cylinder is provided with a mounting position for mounting a test body and a lower opening for opening the first end face of the test body, the mounting position is provided with a heat insulation sealing gasket, and the second end of the isolation cylinder is opened and is provided with a connecting flange;

the adapter flange is connected with the connecting flange and is used for connecting a metal hose;

the heating body is arranged in the isolation cylinder, a first end face of the heating body is used for being attached to a second end face of the test body, and the heating body is provided with a heating hole along the axial direction;

a heater installed at the heating hole;

and the press fitting flange is press fitted on the second end surface of the heating body and is detachably connected with the first end of the isolation cylinder through a threaded connecting piece.

2. The critical heat flux density enhancement test device of claim 1, wherein the isolation cartridge comprises:

the first end of the isolation sleeve is open;

the supporting flange is in threaded connection with the lower end of the isolation sleeve, the supporting flange is connected with the threaded connecting piece, and the mounting position and the lower opening are arranged on the supporting flange.

3. The critical heat flux density enhancement test device of claim 2, wherein the support flange has a multistage stepped support groove facing the heating body, the support groove defines the mounting location, the heat insulating gasket has a stepped outer circumferential surface and is mounted in the support groove, and the heat insulating gasket and the support groove are pressed against at least two mutually perpendicular surfaces.

4. The critical heat flux density enhancement test device according to claim 1, wherein the press-fitting flange is annular, the central hole of the press-fitting flange is used for avoiding the heating hole of the heating body, the press-fitting flange is provided with a plurality of through holes distributed at intervals along the circumferential direction, the through holes surround the outer circumference of the heating body and are spaced from the circumferential wall of the heating body, and the threaded connecting piece penetrates through the through holes.

5. The critical heat flux density enhancement test device of claim 1, wherein the outer diameter of the press-fitting flange is smaller than the inner diameter of the isolation cylinder, and a plurality of notches are formed in the periphery of the press-fitting flange.

6. The critical heat flux density enhancement test device according to claim 1, wherein a second end surface of the press-fitting flange facing the heating body is provided with a press-fitting groove, a bottom wall of the press-fitting groove is used for abutting against the second end surface of the heating body, and a peripheral wall of the press-fitting groove is tapered.

7. The critical heat flux density enhancement test device according to claim 1, wherein the heating hole penetrates through the heating body along an axial direction of the heating body, the heating hole comprises a plurality of heating holes distributed at intervals, and the heaters comprise a plurality of rods extending into the heating hole.

8. The critical heat flux density enhancement test device of any one of claims 1-7, further comprising: the rotating shaft is connected with the isolating cylinder and used for being connected with a driving mechanism.

9. The critical heat flux density enhancement test device of any one of claims 1-7, further comprising:

the test body, the test body install in the installation position, the first terminal surface of test body is followed under uncovered exposing, the second terminal surface of test body with the laminating of the first terminal surface of heating member, the perisporium of test body is equipped with a plurality of test holes to axle center extension, and is a plurality of the test hole reaches the distance of the second terminal surface of test body is different, the thermocouple has been inserted to the test hole.

10. The critical heat flux density enhancement test device of claim 9, wherein the second end face of the test body is provided with a heating groove, and the peripheral wall of the heating groove is a conical surface.

11. The critical heat flux density enhancement test device according to claim 9, wherein the peripheral wall of the test body is provided with a notch which penetrates through the test body along the axial direction, the test hole is opened in the notch, and the width of the notch is larger than the aperture of the test hole.

12. The critical heat flux density enhancement test device of claim 9, wherein the upper wall of the open end of the test well is provided with a guide surface.

13. The critical heat flux density enhancement test device of claim 9, wherein the test body comprises an oxygen-free copper substrate and steel layers covering a first end face and a second end face of the oxygen-free copper substrate, and the steel layer at the second end face has a porous coating.

14. The critical heat flux density enhancement test device of any one of claims 1-7, further comprising:

and the heat preservation layer is coated outside the isolation cylinder and exposed out of the lower opening.